7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.6 High
AI Score
Confidence
High
0.004 Low
EPSS
Percentile
72.9%
The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:1093 advisory.
In do_epoll_ctl and ep_loop_check_proc of eventpoll.c, there is a possible use after free due to a logic error. This could lead to local escalation of privilege with no additional execution privileges needed.
User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
A-147802478References: Upstream kernel (CVE-2020-0466)
An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before 5.9.2. It has an infinite loop related to improper interaction between a resampler and edge triggering, aka CID-77377064c3a9. (CVE-2020-27152)
In drivers/target/target_core_xcopy.c in the Linux kernel before 5.10.7, insufficient identifier checking in the LIO SCSI target code can be used by remote attackers to read or write files via directory traversal in an XCOPY request, aka CID-2896c93811e3. For example, an attack can occur over a network if the attacker has access to one iSCSI LUN. The attacker gains control over file access because I/O operations are proxied via an attacker-selected backstore. (CVE-2020-28374)
An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
(CVE-2021-3347)
A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.
(CVE-2021-26708)
An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport’s handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module’s global variables. (CVE-2021-27363)
An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is adversely affected by the ability of an unprivileged user to craft Netlink messages. (CVE-2021-27364)
An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message. (CVE-2021-27365)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2021:1093.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(157559);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/10");
script_cve_id(
"CVE-2020-0466",
"CVE-2020-27152",
"CVE-2020-28374",
"CVE-2021-3347",
"CVE-2021-26708",
"CVE-2021-27363",
"CVE-2021-27364",
"CVE-2021-27365"
);
script_xref(name:"ALSA", value:"2021:1093");
script_name(english:"AlmaLinux 8 : kernel (ALSA-2021:1093)");
script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ALSA-2021:1093 advisory.
- In do_epoll_ctl and ep_loop_check_proc of eventpoll.c, there is a possible use after free due to a logic
error. This could lead to local escalation of privilege with no additional execution privileges needed.
User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
A-147802478References: Upstream kernel (CVE-2020-0466)
- An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before
5.9.2. It has an infinite loop related to improper interaction between a resampler and edge triggering,
aka CID-77377064c3a9. (CVE-2020-27152)
- In drivers/target/target_core_xcopy.c in the Linux kernel before 5.10.7, insufficient identifier checking
in the LIO SCSI target code can be used by remote attackers to read or write files via directory traversal
in an XCOPY request, aka CID-2896c93811e3. For example, an attack can occur over a network if the attacker
has access to one iSCSI LUN. The attacker gains control over file access because I/O operations are
proxied via an attacker-selected backstore. (CVE-2020-28374)
- An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free
during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
(CVE-2021-3347)
- A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions
in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race
conditions were implicitly introduced in the commits that added VSOCK multi-transport support.
(CVE-2021-26708)
- An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine
the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI
subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at
/sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in
drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the
pointer to an iscsi_transport struct in the kernel module's global variables. (CVE-2021-27363)
- An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is
adversely affected by the ability of an unprivileged user to craft Netlink messages. (CVE-2021-27364)
- An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have
appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can
send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a
Netlink message. (CVE-2021-27365)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://errata.almalinux.org/8/ALSA-2021-1093.html");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3347");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-28374");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/11/06");
script_set_attribute(attribute:"patch_publication_date", value:"2021/04/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/09");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bpftool");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-abi-whitelists");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-core");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-cross-headers");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-debug-core");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-debug-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-debug-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-debug-modules-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-headers");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-modules-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-tools-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:kernel-tools-libs-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:perf");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:python3-perf");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Alma Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");
exit(0);
}
include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('rpm.inc');
include('ksplice.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/AlmaLinux/release');
if (isnull(release) || 'AlmaLinux' >!< release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
var os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);
if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);
if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
rm_kb_item(name:'Host/uptrack-uname-r');
var cve_list = make_list('CVE-2020-0466', 'CVE-2020-27152', 'CVE-2020-28374', 'CVE-2021-3347', 'CVE-2021-26708', 'CVE-2021-27363', 'CVE-2021-27364', 'CVE-2021-27365');
if (ksplice_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for ALSA-2021:1093');
}
else
{
__rpm_report = ksplice_reporting_text();
}
}
var pkgs = [
{'reference':'bpftool-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-abi-whitelists-4.18.0-240.22.1.el8_3', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-core-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-cross-headers-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-core-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-devel-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-modules-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-modules-extra-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-devel-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-headers-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-modules-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-modules-extra-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-devel-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'perf-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-perf-4.18.0-240.22.1.el8_3', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
];
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var release = NULL;
var sp = NULL;
var cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = 'Alma-' + package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && release && (!exists_check || rpm_exists(release:release, rpm:exists_check))) {
if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'bpftool / kernel / kernel-abi-whitelists / kernel-core / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
alma | linux | bpftool | p-cpe:/a:alma:linux:bpftool |
alma | linux | kernel | p-cpe:/a:alma:linux:kernel |
alma | linux | kernel-abi-whitelists | p-cpe:/a:alma:linux:kernel-abi-whitelists |
alma | linux | kernel-core | p-cpe:/a:alma:linux:kernel-core |
alma | linux | kernel-cross-headers | p-cpe:/a:alma:linux:kernel-cross-headers |
alma | linux | kernel-debug | p-cpe:/a:alma:linux:kernel-debug |
alma | linux | kernel-debug-core | p-cpe:/a:alma:linux:kernel-debug-core |
alma | linux | kernel-debug-devel | p-cpe:/a:alma:linux:kernel-debug-devel |
alma | linux | kernel-debug-modules | p-cpe:/a:alma:linux:kernel-debug-modules |
alma | linux | kernel-debug-modules-extra | p-cpe:/a:alma:linux:kernel-debug-modules-extra |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0466
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27152
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28374
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26708
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27363
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27364
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27365
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3347
errata.almalinux.org/8/ALSA-2021-1093.html
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.6 High
AI Score
Confidence
High
0.004 Low
EPSS
Percentile
72.9%